364 Evolution and Adaptation 
NuMBER Numser |Maximum oF/MinimuM oF| AVERAGE 
NaTuRE OF UNION or FLowers| oF SEED |SEEDSIN ANy|SEEDS IN ANY|No. OF SEEDS 
. FERTILIZED | CapsuLES [ONE CaPSULE|ONE CAPSULE|PER CAPSULE 
Long-styled form by 
pollen of  short- 
styled form : 
Legitimate union. 
10 6 62 34 46.5 
Long-styled form by 
own-form pollen : 20 4 49 2 27.7 
Mlegitimate union. 
Short-styled form by 
pollen of long- 8 61 
styled form : ve 
Legitimate union. 
37 47-7 
Short-styled form by 
own-form pollen : 17 3 19 6 12.1 
Illegitimate union. 
The two legitimate 
6 I 
unions together. - 14 2 37 47 
The two illegitimate 
unions together. 3° 7 49 2 35-5 
styled plants. It is evident from these results that the long- 
form pistils, fertilized with pollen from flowers of the same 
pistil-form (from other individuals as a rule), tend to produce 
the same form as their parents, although occasionally the 
other form. The fertility of these plants from an illegitimate 
union is found to be very low. Darwin observed that some- 
times the male and female organs of these plants were in a 
very deteriorated condition. It is interesting to notice, in 
this connection, that in another species, Primula SUMENSTS, 
illegitimate plants from long-styled parents were vigorous, 
but the flowers were small and more like the wild form. 
They were, however, perfectly fertile. 
